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avformat/apm: fix variable/structure names and cosmetics

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This commit is contained in:
Zane van Iperen 2020-07-06 18:50:52 +10:00
parent 1b0a0da63a
commit 91a9f86edf
1 changed files with 48 additions and 46 deletions
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94
libavformat/apm.c
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@ -44,37 +44,37 @@ typedef struct APMState {
int32_t saved_l;
} APMState;
typedef struct APMVS12Chunk {
typedef struct APMExtraData {
uint32_t magic;
uint32_t file_size;
uint32_t data_size;
uint32_t unk1;
uint32_t unk2;
APMState state;
uint32_t pad[7];
uint32_t unk3[7];
uint32_t data;
} APMVS12Chunk;
} APMExtraData;
static void apm_parse_vs12(APMVS12Chunk *vs12, const uint8_t *buf)
static void apm_parse_extradata(APMExtraData *ext, const uint8_t *buf)
{
vs12->magic = AV_RL32(buf + 0);
vs12->file_size = AV_RL32(buf + 4);
vs12->data_size = AV_RL32(buf + 8);
vs12->unk1 = AV_RL32(buf + 12);
vs12->unk2 = AV_RL32(buf + 16);
ext->magic = AV_RL32(buf + 0);
ext->file_size = AV_RL32(buf + 4);
ext->data_size = AV_RL32(buf + 8);
ext->unk1 = AV_RL32(buf + 12);
ext->unk2 = AV_RL32(buf + 16);
vs12->state.has_saved = AV_RL32(buf + 20);
vs12->state.predictor_r = AV_RL32(buf + 24);
vs12->state.step_index_r = AV_RL32(buf + 28);
vs12->state.saved_r = AV_RL32(buf + 32);
vs12->state.predictor_l = AV_RL32(buf + 36);
vs12->state.step_index_l = AV_RL32(buf + 40);
vs12->state.saved_l = AV_RL32(buf + 44);
ext->state.has_saved = AV_RL32(buf + 20);
ext->state.predictor_r = AV_RL32(buf + 24);
ext->state.step_index_r = AV_RL32(buf + 28);
ext->state.saved_r = AV_RL32(buf + 32);
ext->state.predictor_l = AV_RL32(buf + 36);
ext->state.step_index_l = AV_RL32(buf + 40);
ext->state.saved_l = AV_RL32(buf + 44);
for (int i = 0; i < FF_ARRAY_ELEMS(vs12->pad); i++)
vs12->pad[i] = AV_RL32(buf + 48 + (i * 4));
for (int i = 0; i < FF_ARRAY_ELEMS(ext->unk3); i++)
ext->unk3[i] = AV_RL32(buf + 48 + (i * 4));
vs12->data = AV_RL32(buf + 76);
ext->data = AV_RL32(buf + 76);
}
static int apm_probe(const AVProbeData *p)
@ -98,7 +98,8 @@ static int apm_read_header(AVFormatContext *s)
{
int64_t ret;
AVStream *st;
APMVS12Chunk vs12;
APMExtraData extradata;
AVCodecParameters *par;
uint8_t buf[APM_FILE_EXTRADATA_SIZE];
if (!(st = avformat_new_stream(s, NULL)))
@ -111,67 +112,68 @@ static int apm_read_header(AVFormatContext *s)
if (avio_rl16(s->pb) != APM_TAG_CODEC)
return AVERROR_INVALIDDATA;
st->codecpar->channels = avio_rl16(s->pb);
st->codecpar->sample_rate = avio_rl32(s->pb);
par = st->codecpar;
par->channels = avio_rl16(s->pb);
par->sample_rate = avio_rl32(s->pb);
/* Skip the bitrate, it's usually wrong anyway. */
if ((ret = avio_skip(s->pb, 4)) < 0)
return ret;
st->codecpar->block_align = avio_rl16(s->pb);
st->codecpar->bits_per_coded_sample = avio_rl16(s->pb);
par->block_align = avio_rl16(s->pb);
par->bits_per_coded_sample = avio_rl16(s->pb);
if (avio_rl32(s->pb) != APM_FILE_EXTRADATA_SIZE)
return AVERROR_INVALIDDATA;
/* I've never seen files greater than this. */
if (st->codecpar->sample_rate > 44100)
if (par->sample_rate > 44100)
return AVERROR_INVALIDDATA;
if (st->codecpar->bits_per_coded_sample != 4)
if (par->bits_per_coded_sample != 4)
return AVERROR_INVALIDDATA;
if (st->codecpar->channels == 2)
st->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
else if (st->codecpar->channels == 1)
st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
if (par->channels == 2)
par->channel_layout = AV_CH_LAYOUT_STEREO;
else if (par->channels == 1)
par->channel_layout = AV_CH_LAYOUT_MONO;
else
return AVERROR_INVALIDDATA;
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
st->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_APM;
st->codecpar->format = AV_SAMPLE_FMT_S16;
st->codecpar->bits_per_raw_sample = 16;
st->codecpar->bit_rate = st->codecpar->channels *
st->codecpar->sample_rate *
st->codecpar->bits_per_coded_sample;
par->codec_type = AVMEDIA_TYPE_AUDIO;
par->codec_id = AV_CODEC_ID_ADPCM_IMA_APM;
par->format = AV_SAMPLE_FMT_S16;
par->bits_per_raw_sample = 16;
par->bit_rate = par->channels *
par->sample_rate *
par->bits_per_coded_sample;
if ((ret = avio_read(s->pb, buf, APM_FILE_EXTRADATA_SIZE)) < 0)
return ret;
else if (ret != APM_FILE_EXTRADATA_SIZE)
return AVERROR(EIO);
apm_parse_vs12(&vs12, buf);
apm_parse_extradata(&extradata, buf);
if (vs12.magic != APM_TAG_VS12 || vs12.data != APM_TAG_DATA)
if (extradata.magic != APM_TAG_VS12 || extradata.data != APM_TAG_DATA)
return AVERROR_INVALIDDATA;
if (vs12.state.has_saved) {
if (extradata.state.has_saved) {
avpriv_request_sample(s, "Saved Samples");
return AVERROR_PATCHWELCOME;
}
if ((ret = ff_alloc_extradata(st->codecpar, APM_EXTRADATA_SIZE)) < 0)
if ((ret = ff_alloc_extradata(par, APM_EXTRADATA_SIZE)) < 0)
return ret;
/* Use the entire state as extradata. */
memcpy(st->codecpar->extradata, buf + 20, APM_EXTRADATA_SIZE);
memcpy(par->extradata, buf + 20, APM_EXTRADATA_SIZE);
avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
avpriv_set_pts_info(st, 64, 1, par->sample_rate);
st->start_time = 0;
st->duration = vs12.data_size *
(8 / st->codecpar->bits_per_coded_sample) /
st->codecpar->channels;
st->duration = extradata.data_size *
(8 / par->bits_per_coded_sample) /
par->channels;
return 0;
}