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https://github.com/WinampDesktop/winamp.git
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565 lines
13 KiB
C++
565 lines
13 KiB
C++
#include "demuxer.h"
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#include "read.h"
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#include "avi_reader.h"
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static int GetStreamNumber(uint32_t id)
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{
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char *stream_data = (char *)(&id);
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if (!isxdigit(stream_data[0]) || !isxdigit(stream_data[1]))
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return -1;
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stream_data[2] = 0;
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int stream_number = strtoul(stream_data, 0, 16);
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return stream_number;
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}
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nsavi::Demuxer::Demuxer(nsavi::avi_reader *_reader) : ParserBase(_reader)
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{
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movie_found = NOT_READ;
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idx1_found = NOT_READ;
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info_found = NOT_READ;
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movie_start = 0;
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index = 0;
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info = 0;
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}
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// reads a chunk and updates parse state variable on error
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static int ReadChunk(nsavi::avi_reader *reader, nsavi::riff_chunk *chunk, nsavi::ParseState &state, uint32_t *bytes_read)
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{
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int ret = nsavi::read_riff_chunk(reader, chunk, bytes_read);
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if (ret == nsavi::READ_EOF)
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{
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state = nsavi::NOT_FOUND;
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return nsavi::READ_NOT_FOUND;
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}
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else if (ret > nsavi::READ_OK)
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{
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state = nsavi::PARSE_ERROR;
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return ret;
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}
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else if (ret < nsavi::READ_OK)
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{ // pass-thru return value from avi_reader
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state = nsavi::PARSE_RESYNC;
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return ret;
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}
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return nsavi::READ_OK;
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}
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// skips a chunk and updates a parser state variable on error
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static int SkipChunk(nsavi::avi_reader *reader, const nsavi::riff_chunk *chunk, nsavi::ParseState &state, uint32_t *bytes_read)
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{
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int ret = nsavi::skip_chunk(reader, chunk, bytes_read);
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if (ret == nsavi::READ_EOF)
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{
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state = nsavi::NOT_FOUND;
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return nsavi::READ_NOT_FOUND;
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}
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else if (ret > nsavi::READ_OK)
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{
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state = nsavi::PARSE_ERROR;
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return ret;
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}
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else if (ret < nsavi::READ_OK)
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{ // pass-thru return value from avi_reader
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state = nsavi::PARSE_RESYNC;
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return ret;
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}
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return nsavi::READ_OK;
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}
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static int Read(nsavi::avi_reader *reader, void *buffer, uint32_t size, nsavi::ParseState &state, uint32_t *out_bytes_read)
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{
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uint32_t bytes_read;
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int ret = reader->Read(buffer, size, &bytes_read);
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if (ret > nsavi::READ_OK)
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{
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state = nsavi::PARSE_ERROR;
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return ret;
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}
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else if (ret < nsavi::READ_OK)
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{ // pass-thru return value from avi_reader
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state = nsavi::PARSE_RESYNC;
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return ret;
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}
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else if (bytes_read != size)
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{
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state = nsavi::PARSE_ERROR;
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return nsavi::READ_EOF;
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}
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*out_bytes_read = bytes_read;
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return nsavi::READ_OK;
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}
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int nsavi::Demuxer::GetHeaderList(HeaderList *header_list)
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{
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if (riff_parsed != PARSED)
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return READ_INVALID_CALL;
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if (riff_parsed == PARSE_RESYNC)
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reader->Seek(riff_start);
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if (header_list_parsed == NOT_READ)
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{
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// first, see how far we are into the file to properly bound our reads
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uint64_t start = reader->Tell();
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uint32_t bytes_available = riff_header.size;
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bytes_available -= (uint32_t)(start - riff_start);
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while (bytes_available)
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{
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if (bytes_available < 8)
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{
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header_list_parsed = NOT_FOUND;
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return READ_NOT_FOUND;
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}
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uint32_t bytes_read;
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riff_chunk chunk;
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int ret = ReadChunk(reader, &chunk, header_list_parsed, &bytes_read);
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if (ret)
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return ret;
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bytes_available -= bytes_read;
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if (bytes_available < chunk.size)
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{
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header_list_parsed = PARSE_ERROR;
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return READ_INVALID_DATA;
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}
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switch(chunk.id)
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{
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case 'TSIL': // list chunk
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switch(chunk.type)
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{
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case 'lrdh': // this is what we're looking for
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ret = ParseHeaderList(chunk.size, &bytes_read);
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if (ret == READ_OK)
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{
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header_list->avi_header = avi_header;
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header_list->stream_list = stream_list;
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header_list->stream_list_size = stream_list_size;
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header_list->odml_header = odml_header;
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}
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return ret;
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case 'OFNI': // INFO
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if (!info)
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{
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info = new nsavi::Info();
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if (!info)
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{
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header_list_parsed = PARSE_ERROR;
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return READ_OUT_OF_MEMORY;
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}
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ret = info->Read(reader, chunk.size);
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if (ret)
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{
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header_list_parsed = PARSE_ERROR;
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return ret;
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}
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break;
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}
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// fall through
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default: // skip anything we don't understand
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ret = SkipChunk(reader, &chunk, header_list_parsed, &bytes_read);
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if (ret)
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return ret;
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bytes_available -= bytes_read;
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break;
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}
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break;
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default: // skip anything we don't understand
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case 'KNUJ': // skip junk chunks
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ret = SkipChunk(reader, &chunk, header_list_parsed, &bytes_read);
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if (ret)
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return ret;
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bytes_available -= bytes_read;
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break;
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// TODO; case '1xdi': break;
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}
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}
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}
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if (header_list_parsed == PARSED)
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{
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header_list->avi_header = avi_header;
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header_list->stream_list = stream_list;
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header_list->stream_list_size = stream_list_size;
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header_list->odml_header = odml_header;
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return READ_OK;
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}
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return READ_INVALID_CALL;
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}
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int nsavi::Demuxer::FindMovieChunk()
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{
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if (riff_parsed != PARSED)
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return READ_INVALID_CALL;
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if (header_list_parsed != READ_OK)
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return READ_INVALID_CALL;
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if (movie_found == PARSED)
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return READ_OK;
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if (movie_found == NOT_READ)
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{
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// first, see how far we are into the file to properly bound our reads
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uint64_t start = reader->Tell();
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uint32_t bytes_available = riff_header.size;
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bytes_available -= (uint32_t)(start - riff_start);
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while (movie_found == NOT_READ)
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{
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if (bytes_available < 8)
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{
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header_list_parsed = NOT_FOUND;
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return READ_NOT_FOUND;
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}
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uint32_t bytes_read;
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int ret = ReadChunk(reader, &movi_header, movie_found, &bytes_read);
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if (ret)
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return ret;
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bytes_available -= bytes_read;
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if (bytes_available < movi_header.size)
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{
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movie_found = PARSE_ERROR;
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return READ_INVALID_DATA;
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}
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switch(movi_header.id)
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{
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// TODO: parse any other interesting chunks along the way
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case 'TSIL': // list chunk
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switch(movi_header.type)
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{
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case 'ivom':
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{
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movie_found = PARSED;
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movie_start = reader->Tell();
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return READ_OK;
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}
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break;
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case '1xdi': // index v1 chunk
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if (!index)
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{
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index = (nsavi::IDX1 *)malloc(idx1_header.size + sizeof(uint32_t));
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if (index)
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{
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ret = Read(reader, ((uint8_t *)index) + sizeof(uint32_t), idx1_header.size, idx1_found, &bytes_read);
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if (ret)
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return ret;
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bytes_available-=bytes_read;
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index->index_count = idx1_header.size / sizeof(IDX1_INDEX);
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if ((idx1_header.size & 1) && bytes_available)
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{
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bytes_available--;
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reader->Skip(1);
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}
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idx1_found = PARSED;
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}
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else
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{
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return READ_OUT_OF_MEMORY;
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}
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}
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else
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{
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ret = SkipChunk(reader, &movi_header, movie_found, &bytes_read);
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if (ret)
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return ret;
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bytes_available -= bytes_read;
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}
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break;
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case 'OFNI': // INFO
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if (!info)
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{
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info = new nsavi::Info();
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if (!info)
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{
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movie_found = PARSE_ERROR;
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return READ_OUT_OF_MEMORY;
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}
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ret = info->Read(reader, movi_header.size);
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if (ret)
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{
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movie_found = PARSE_ERROR;
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return ret;
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}
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break;
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}
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// fall through
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default: // skip anything we don't understand
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ret = SkipChunk(reader, &movi_header, movie_found, &bytes_read);
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if (ret)
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return ret;
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bytes_available -= bytes_read;
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break;
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}
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break;
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default: // skip anything we don't understand
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case 'KNUJ': // skip junk chunks
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ret = SkipChunk(reader, &movi_header, movie_found, &bytes_read);
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if (ret)
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return ret;
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bytes_available -= bytes_read;
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break;
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}
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}
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}
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return nsavi::READ_NOT_FOUND; // TODO: not sure about this
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}
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int nsavi::Demuxer::SeekToMovieChunk(nsavi::avi_reader *reader)
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{
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return reader->Seek(movie_start);
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}
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int nsavi::Demuxer::GetNextMovieChunk(nsavi::avi_reader *reader, void **data, uint32_t *chunk_size, uint32_t *chunk_type, int limit_stream_num)
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{
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ParseState no_state;
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if (movie_found == PARSED)
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{
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uint64_t start = reader->Tell();
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uint32_t bytes_available = movi_header.size;
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bytes_available -= (uint32_t)(start - movie_start);
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uint32_t bytes_read;
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riff_chunk chunk;
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again:
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int ret = ReadChunk(reader, &chunk, no_state, &bytes_read);
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if (ret)
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return ret;
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if (chunk.id == 'TSIL' || chunk.id == 'FFIR')
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{
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goto again; // skip 'rec' chunk headers
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}
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if (chunk.id == 'KNUJ' || chunk.id == '1xdi')
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{
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SkipChunk(reader, &chunk, no_state, &bytes_read);
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goto again;
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}
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if (limit_stream_num != 65536)
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{
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if (limit_stream_num != GetStreamNumber(chunk.id))
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{
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SkipChunk(reader, &chunk, no_state, &bytes_read);
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goto again;
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}
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}
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*data = malloc(chunk.size);
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if (!*data)
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return READ_OUT_OF_MEMORY;
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*chunk_size = chunk.size;
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*chunk_type = chunk.id;
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ret = Read(reader, *data, chunk.size, no_state, &bytes_read);
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if (ret)
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return ret;
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if ((chunk.size & 1))
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{
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bytes_available--;
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reader->Skip(1);
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}
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return READ_OK;
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}
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else
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return READ_FAILED;
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}
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int nsavi::Demuxer::GetSeekTable(nsavi::IDX1 **out_index)
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{
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if (idx1_found == PARSED)
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{
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*out_index = index;
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return READ_OK;
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}
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if (idx1_found == NOT_FOUND)
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{
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return READ_NOT_FOUND;
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}
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if (idx1_found != NOT_READ)
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return READ_FAILED;
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uint64_t old_position = reader->Tell();
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if (movie_found == PARSED)
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reader->Seek(movie_start+movi_header.size);
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else
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reader->Seek(riff_start);
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uint64_t start = reader->Tell();
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uint32_t bytes_available = riff_header.size;
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bytes_available -= (uint32_t)(start - riff_start);
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while (idx1_found == NOT_READ)
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{
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if (bytes_available < 8)
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{
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idx1_found = NOT_FOUND;
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reader->Seek(old_position);
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return READ_NOT_FOUND;
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}
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uint32_t bytes_read;
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int ret = ReadChunk(reader, &idx1_header, idx1_found, &bytes_read);
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if (ret)
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return ret;
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bytes_available -= bytes_read;
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if (bytes_available == (idx1_header.size - 12)) // some stupid program has this bug
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{
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idx1_header.size-=12;
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}
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if (bytes_available < idx1_header.size)
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{
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idx1_found = PARSE_ERROR;
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reader->Seek(old_position);
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return READ_INVALID_DATA;
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}
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switch(idx1_header.id)
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{
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// TODO: parse any other interesting chunks along the way
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case '1xdi': // index v1 chunk
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index = (nsavi::IDX1 *)malloc(idx1_header.size + sizeof(uint32_t));
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if (index)
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{
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ret = Read(reader, ((uint8_t *)index) + sizeof(uint32_t), idx1_header.size, idx1_found, &bytes_read);
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if (ret)
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{
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reader->Seek(old_position);
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return ret;
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}
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bytes_available-=bytes_read;
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index->index_count = idx1_header.size / sizeof(IDX1_INDEX);
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if ((idx1_header.size & 1) && bytes_available)
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{
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bytes_available--;
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reader->Skip(1);
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}
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idx1_found = PARSED;
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}
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else
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{
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reader->Seek(old_position);
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return READ_OUT_OF_MEMORY;
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}
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break;
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default: // skip anything we don't understand
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case 'KNUJ': // skip junk chunks
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ret = SkipChunk(reader, &idx1_header, idx1_found, &bytes_read);
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if (ret)
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return ret;
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bytes_available -= bytes_read;
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break;
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}
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}
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*out_index = index;
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reader->Seek(old_position);
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return READ_OK;
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}
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int nsavi::Demuxer::GetIndexChunk(nsavi::INDX **out_index, uint64_t offset)
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{
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nsavi::INDX *index = 0;
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uint64_t old_position = reader->Tell();
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reader->Seek(offset);
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ParseState dummy;
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uint32_t bytes_read;
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riff_chunk chunk;
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int ret = ReadChunk(reader, &chunk, dummy, &bytes_read);
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if (ret)
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return ret;
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index = (nsavi::INDX *)malloc(sizeof(uint32_t) + chunk.size);
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if (index)
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{
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ret = Read(reader, ((uint8_t *)index) + sizeof(uint32_t), chunk.size, dummy, &bytes_read);
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if (ret)
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{
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reader->Seek(old_position);
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return ret;
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}
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index->size_bytes=chunk.size;
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}
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else
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{
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reader->Seek(old_position);
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return READ_OUT_OF_MEMORY;
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}
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*out_index = index;
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reader->Seek(old_position);
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return READ_OK;
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}
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static bool IsCodecChunk(uint32_t header)
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{
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char *blah = (char *)&header;
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if (blah[0] != 'i' && !isxdigit(blah[0]))
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return false;
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if (blah[1] != 'x' && !isxdigit(blah[1]))
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return false;
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return true;
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}
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int nsavi::Demuxer::Seek(uint64_t offset, bool absolute, nsavi::avi_reader *reader)
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{
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/* verify index by reading the riff chunk and comparing position->chunk_id and position->size with the read chunk
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if it fails, we'll try the two following things
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1) try again without the -4
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2) try from the start of the file
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3) try from riff_start
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*/
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uint32_t bytes_read;
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uint32_t chunk_header=0;
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if (!reader)
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reader = this->reader;
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if (absolute)
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{
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reader->Seek(offset - 8);
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reader->Peek(&chunk_header, 4, &bytes_read);
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if (!IsCodecChunk(chunk_header))
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{
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reader->Skip(4);
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reader->Peek(&chunk_header, 4, &bytes_read);
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if (!IsCodecChunk(chunk_header))
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{
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reader->Skip(4);
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}
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}
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}
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else
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{
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reader->Seek(movie_start+offset - 4);
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reader->Peek(&chunk_header, 4, &bytes_read);
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if (!IsCodecChunk(chunk_header))
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{
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reader->Seek(offset);
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}
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}
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|
|
|
/*
|
|
riff_chunk test;
|
|
ParseState blah;
|
|
uint32_t bytes_read;
|
|
ReadChunk(f, &test, blah, &bytes_read);
|
|
fseek64(f, movie_start+position->offset - 4, SEEK_SET);
|
|
*/
|
|
return READ_OK;
|
|
}
|