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Improve MPEG FSB/EA-MP3/AHX reads

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This commit is contained in:
bnnm 2019-10-27 23:55:32 +01:00
parent 2e509b8fff
commit 409a10172a
3 changed files with 21 additions and 18 deletions
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2
src/coding/mpeg_custom_utils.c
View File

@ -132,7 +132,7 @@ int mpeg_custom_parse_frame_default(VGMSTREAMCHANNEL *stream, mpeg_codec_data *d
current_interleave_pre = current_interleave*num_stream;
current_interleave_post = current_interleave*(data->streams_size-1) - current_interleave_pre;
if ( !mpeg_get_frame_info(stream->streamfile, stream->offset, &info) )
if (!mpeg_get_frame_info(stream->streamfile, stream->offset + current_interleave_pre, &info))
goto fail;
current_data_size = info.frame_size;

34
src/coding/mpeg_custom_utils_ahx.c
View File

@ -7,42 +7,45 @@ static int ahx_decrypt_type08(uint8_t * buffer, mpeg_custom_config *config);
/* writes data to the buffer and moves offsets, transforming AHX frames as needed */
int mpeg_custom_parse_frame_ahx(VGMSTREAMCHANNEL *stream, mpeg_codec_data *data, int num_stream) {
/* 0xFFF5E0C0 header: frame size 0x414 (160kbps, 22050Hz) but they actually are much shorter */
mpeg_custom_stream *ms = data->streams[num_stream];
size_t current_data_size = 0;
size_t file_size = get_streamfile_size(stream->streamfile);
/* AHX has a 0xFFF5E0C0 header with frame size 0x414 (160kbps, 22050Hz) but they actually are much shorter */
/* read supposed frame size first (to minimize reads) */
ms->bytes_in_buffer = read_streamfile(ms->buffer, stream->offset, MPEG_AHX_EXPECTED_FRAME_SIZE, stream->streamfile);
/* find actual frame size by looking for the next frame header */
{
uint32_t current_header = (uint32_t)read_32bitBE(stream->offset, stream->streamfile);
off_t next_offset = 0x04;
uint32_t current_header = get_u32be(ms->buffer);
int next_pos = 0x04;
while (next_offset <= MPEG_AHX_EXPECTED_FRAME_SIZE) {
uint32_t next_header = (uint32_t)read_32bitBE(stream->offset + next_offset, stream->streamfile);
while (next_pos <= MPEG_AHX_EXPECTED_FRAME_SIZE) {
uint32_t next_header = get_u32be(ms->buffer + next_pos);
if (current_header == next_header) {
current_data_size = next_offset;
current_data_size = next_pos;
break;
}
/* AHXs end in a 0x0c footer (0x41485845 0x28632943 0x52490000 / "AHXE" "(c)C" "RI\0\0") */
if (stream->offset + next_offset + 0x0c >= file_size) {
current_data_size = next_offset;
/* AHXs end in a 0x0c footer (0x41485845 28632943 52490000 / "AHXE(c)CRI\0\0") */
if (stream->offset + next_pos + 0x0c >= file_size) {
current_data_size = next_pos;
break;
}
next_offset++;
next_pos++;
}
}
if (!current_data_size || current_data_size > ms->buffer_size || current_data_size > MPEG_AHX_EXPECTED_FRAME_SIZE) {
if (current_data_size == 0 || current_data_size > ms->buffer_size || current_data_size > MPEG_AHX_EXPECTED_FRAME_SIZE) {
VGM_LOG("MPEG AHX: incorrect data_size 0x%x\n", current_data_size);
goto fail;
}
/* 0-fill up to expected size to keep mpg123 happy */
ms->bytes_in_buffer = read_streamfile(ms->buffer,stream->offset,current_data_size,stream->streamfile);
memset(ms->buffer + ms->bytes_in_buffer,0, MPEG_AHX_EXPECTED_FRAME_SIZE - ms->bytes_in_buffer);
memset(ms->buffer + current_data_size, 0, MPEG_AHX_EXPECTED_FRAME_SIZE - current_data_size);
ms->bytes_in_buffer = MPEG_AHX_EXPECTED_FRAME_SIZE;
@ -60,7 +63,6 @@ int mpeg_custom_parse_frame_ahx(VGMSTREAMCHANNEL *stream, mpeg_codec_data *data,
if (stream->offset + 0x0c >= file_size)
stream->offset = file_size; /* skip 0x0c footer to reach EOF (shouldn't happen normally) */
return 1;
fail:
return 0;
@ -79,7 +81,7 @@ static int ahx_decrypt_type08(uint8_t * buffer, mpeg_custom_config *config) {
/* read 2b from a bitstream offset to decrypt, and use it as an index to get the key.
* AHX encrypted bitstream starts at 107b (0x0d*8+3), every frame, and seem to always use index 2 */
value = (uint32_t)get_32bitBE(buffer + 0x0d);
value = get_u32be(buffer + 0x0d);
index = (value >> (32-3-2)) & 0x03;
switch(index) {
case 0: current_key = 0; break;

3
src/coding/mpeg_custom_utils_eamp3.c
View File

@ -71,10 +71,11 @@ int mpeg_custom_parse_frame_eamp3(VGMSTREAMCHANNEL *stream, mpeg_codec_data *dat
ok = eamp3_parse_frame(stream, data, &eaf);
if (!ok) goto fail;
ms->bytes_in_buffer = read_streamfile(ms->buffer, stream->offset + eaf.pre_size, eaf.mpeg_size, stream->streamfile);
ok = eamp3_write_pcm_block(stream, data, num_stream, &eaf);
if (!ok) goto fail;
ms->bytes_in_buffer = read_streamfile(ms->buffer,stream->offset + eaf.pre_size, eaf.mpeg_size, stream->streamfile);
stream->offset += eaf.frame_size;
if (!eamp3_skip_data(stream, data, num_stream, 0))