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latmdec: fix audio specific config parsing

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Pass the correct size in bits to mpeg4audio_get_config and add a flag
to disable parsing of the sync extension when the size is not known.

Latm with AudioMuxVersion 0 does not specify the size of the audio
specific config. Data after the audio specific config can be
misinterpreted as sync extension resulting in random and wrong configs.
pull/2/head
Janne Grunau 13 years ago
parent 0eea212943
commit fd095539d1
10 changed files with 40 additions and 25 deletions
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  1. 31
      libavcodec/aacdec.c
  2. 2
      libavcodec/alsdec.c
  3. 7
      libavcodec/mpeg4audio.c
  4. 7
      libavcodec/mpeg4audio.h
  5. 3
      libavcodec/mpegaudiodec.c
  6. 2
      libavformat/adtsenc.c
  7. 2
      libavformat/flvdec.c
  8. 2
      libavformat/isom.c
  9. 2
      libavformat/latmenc.c
  10. 3
      libavformat/matroskaenc.c

31
libavcodec/aacdec.c
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@ -452,15 +452,17 @@ static int decode_ga_specific_config(AACContext *ac, AVCodecContext *avctx,
* @param ac pointer to AACContext, may be null
* @param avctx pointer to AVCCodecContext, used for logging
* @param m4ac pointer to MPEG4AudioConfig, used for parsing
* @param data pointer to AVCodecContext extradata
* @param data_size size of AVCCodecContext extradata
* @param data pointer to buffer holding an audio specific config
* @param bit_size size of audio specific config or data in bits
* @param sync_extension look for an appended sync extension
*
* @return Returns error status or number of consumed bits. <0 - error
*/
static int decode_audio_specific_config(AACContext *ac,
AVCodecContext *avctx,
MPEG4AudioConfig *m4ac,
const uint8_t *data, int data_size)
const uint8_t *data, int bit_size,
int sync_extension)
{
GetBitContext gb;
int i;
@ -470,9 +472,9 @@ static int decode_audio_specific_config(AACContext *ac,
av_dlog(avctx, "%02x ", avctx->extradata[i]);
av_dlog(avctx, "\n");
init_get_bits(&gb, data, data_size * 8);
init_get_bits(&gb, data, bit_size);
if ((i = avpriv_mpeg4audio_get_config(m4ac, data, data_size)) < 0)
if ((i = avpriv_mpeg4audio_get_config(m4ac, data, bit_size, sync_extension)) < 0)
return -1;
if (m4ac->sampling_index > 12) {
av_log(avctx, AV_LOG_ERROR, "invalid sampling rate index %d\n", m4ac->sampling_index);
@ -572,7 +574,7 @@ static av_cold int aac_decode_init(AVCodecContext *avctx)
if (avctx->extradata_size > 0) {
if (decode_audio_specific_config(ac, ac->avctx, &ac->m4ac,
avctx->extradata,
avctx->extradata_size) < 0)
avctx->extradata_size*8, 1) < 0)
return -1;
} else {
int sr, i;
@ -2315,13 +2317,20 @@ static inline uint32_t latm_get_value(GetBitContext *b)
}
static int latm_decode_audio_specific_config(struct LATMContext *latmctx,
GetBitContext *gb)
GetBitContext *gb, int asclen)
{
AVCodecContext *avctx = latmctx->aac_ctx.avctx;
MPEG4AudioConfig m4ac;
int config_start_bit = get_bits_count(gb);
int sync_extension = 0;
int bits_consumed, esize;
if (asclen) {
sync_extension = 1;
asclen = FFMIN(asclen, get_bits_left(gb));
} else
asclen = get_bits_left(gb);
if (config_start_bit % 8) {
av_log_missing_feature(latmctx->aac_ctx.avctx, "audio specific "
"config not byte aligned.\n", 1);
@ -2330,7 +2339,7 @@ static int latm_decode_audio_specific_config(struct LATMContext *latmctx,
bits_consumed =
decode_audio_specific_config(NULL, avctx, &m4ac,
gb->buffer + (config_start_bit / 8),
get_bits_left(gb) / 8);
asclen, sync_extension);
if (bits_consumed < 0)
return AVERROR_INVALIDDATA;
@ -2388,11 +2397,11 @@ static int read_stream_mux_config(struct LATMContext *latmctx,
// for all but first stream: use_same_config = get_bits(gb, 1);
if (!audio_mux_version) {
if ((ret = latm_decode_audio_specific_config(latmctx, gb)) < 0)
if ((ret = latm_decode_audio_specific_config(latmctx, gb, 0)) < 0)
return ret;
} else {
int ascLen = latm_get_value(gb);
if ((ret = latm_decode_audio_specific_config(latmctx, gb)) < 0)
if ((ret = latm_decode_audio_specific_config(latmctx, gb, ascLen)) < 0)
return ret;
ascLen -= ret;
skip_bits_long(gb, ascLen);
@ -2514,7 +2523,7 @@ static int latm_decode_frame(AVCodecContext *avctx, void *out,
} else {
if ((err = decode_audio_specific_config(
&latmctx->aac_ctx, avctx, &latmctx->aac_ctx.m4ac,
avctx->extradata, avctx->extradata_size)) < 0)
avctx->extradata, avctx->extradata_size*8, 1)) < 0)
return err;
latmctx->initialized = 1;
}

2
libavcodec/alsdec.c
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@ -291,7 +291,7 @@ static av_cold int read_specific_config(ALSDecContext *ctx)
init_get_bits(&gb, avctx->extradata, avctx->extradata_size * 8);
config_offset = avpriv_mpeg4audio_get_config(&m4ac, avctx->extradata,
avctx->extradata_size);
avctx->extradata_size * 8, 1);
if (config_offset < 0)
return -1;

7
libavcodec/mpeg4audio.c
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@ -76,12 +76,13 @@ static inline int get_sample_rate(GetBitContext *gb, int *index)
avpriv_mpeg4audio_sample_rates[*index];
}
int avpriv_mpeg4audio_get_config(MPEG4AudioConfig *c, const uint8_t *buf, int buf_size)
int avpriv_mpeg4audio_get_config(MPEG4AudioConfig *c, const uint8_t *buf,
int bit_size, int sync_extension)
{
GetBitContext gb;
int specific_config_bitindex;
init_get_bits(&gb, buf, buf_size*8);
init_get_bits(&gb, buf, bit_size);
c->object_type = get_object_type(&gb);
c->sample_rate = get_sample_rate(&gb, &c->sampling_index);
c->chan_config = get_bits(&gb, 4);
@ -117,7 +118,7 @@ int avpriv_mpeg4audio_get_config(MPEG4AudioConfig *c, const uint8_t *buf, int bu
return -1;
}
if (c->ext_object_type != AOT_SBR) {
if (c->ext_object_type != AOT_SBR && sync_extension) {
while (get_bits_left(&gb) > 15) {
if (show_bits(&gb, 11) == 0x2b7) { // sync extension
get_bits(&gb, 11);

7
libavcodec/mpeg4audio.h
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@ -42,14 +42,17 @@ typedef struct {
extern const int avpriv_mpeg4audio_sample_rates[16];
extern const uint8_t ff_mpeg4audio_channels[8];
/**
* Parse MPEG-4 systems extradata to retrieve audio configuration.
* @param[in] c MPEG4AudioConfig structure to fill.
* @param[in] buf Extradata from container.
* @param[in] buf_size Extradata size.
* @param[in] bit_size Extradata size in bits.
* @param[in] sync_extension look for a sync extension after config if true.
* @return On error -1 is returned, on success AudioSpecificConfig bit index in extradata.
*/
int avpriv_mpeg4audio_get_config(MPEG4AudioConfig *c, const uint8_t *buf, int buf_size);
int avpriv_mpeg4audio_get_config(MPEG4AudioConfig *c, const uint8_t *buf,
int bit_size, int sync_extension);
enum AudioObjectType {
AOT_NULL,

3
libavcodec/mpegaudiodec.c
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@ -1966,7 +1966,8 @@ static int decode_init_mp3on4(AVCodecContext * avctx)
return AVERROR_INVALIDDATA;
}
avpriv_mpeg4audio_get_config(&cfg, avctx->extradata, avctx->extradata_size);
avpriv_mpeg4audio_get_config(&cfg, avctx->extradata,
avctx->extradata_size * 8, 1);
if (!cfg.chan_config || cfg.chan_config > 7) {
av_log(avctx, AV_LOG_ERROR, "Invalid channel config number.\n");
return AVERROR_INVALIDDATA;

2
libavformat/adtsenc.c
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@ -37,7 +37,7 @@ int ff_adts_decode_extradata(AVFormatContext *s, ADTSContext *adts, uint8_t *buf
int off;
init_get_bits(&gb, buf, size * 8);
off = avpriv_mpeg4audio_get_config(&m4ac, buf, size);
off = avpriv_mpeg4audio_get_config(&m4ac, buf, size * 8, 1);
if (off < 0)
return off;
skip_bits_long(&gb, off);

2
libavformat/flvdec.c
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@ -534,7 +534,7 @@ static int flv_read_packet(AVFormatContext *s, AVPacket *pkt)
if (st->codec->codec_id == CODEC_ID_AAC) {
MPEG4AudioConfig cfg;
avpriv_mpeg4audio_get_config(&cfg, st->codec->extradata,
st->codec->extradata_size);
st->codec->extradata_size * 8, 1);
st->codec->channels = cfg.channels;
if (cfg.ext_sample_rate)
st->codec->sample_rate = cfg.ext_sample_rate;

2
libavformat/isom.c
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@ -436,7 +436,7 @@ int ff_mp4_read_dec_config_descr(AVFormatContext *fc, AVStream *st, AVIOContext
if (st->codec->codec_id == CODEC_ID_AAC) {
MPEG4AudioConfig cfg;
avpriv_mpeg4audio_get_config(&cfg, st->codec->extradata,
st->codec->extradata_size);
st->codec->extradata_size * 8, 1);
st->codec->channels = cfg.channels;
if (cfg.object_type == 29 && cfg.sampling_index < 3) // old mp3on4
st->codec->sample_rate = avpriv_mpa_freq_tab[cfg.sampling_index];

2
libavformat/latmenc.c
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@ -54,7 +54,7 @@ static int latm_decode_extradata(LATMContext *ctx, uint8_t *buf, int size)
MPEG4AudioConfig m4ac;
init_get_bits(&gb, buf, size * 8);
ctx->off = avpriv_mpeg4audio_get_config(&m4ac, buf, size);
ctx->off = avpriv_mpeg4audio_get_config(&m4ac, buf, size * 8, 1);
if (ctx->off < 0)
return ctx->off;
skip_bits_long(&gb, ctx->off);

3
libavformat/matroskaenc.c
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@ -448,7 +448,8 @@ static void get_aac_sample_rates(AVFormatContext *s, AVCodecContext *codec, int
{
MPEG4AudioConfig mp4ac;
if (avpriv_mpeg4audio_get_config(&mp4ac, codec->extradata, codec->extradata_size) < 0) {
if (avpriv_mpeg4audio_get_config(&mp4ac, codec->extradata,
codec->extradata_size * 8, 1) < 0) {
av_log(s, AV_LOG_WARNING, "Error parsing AAC extradata, unable to determine samplerate.\n");
return;
}

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