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ffmpeg.wasm-core
Commit e7a44f87 authored by Luca Barbato's avatar Luca Barbato
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4xm: refactor fourxm_read_header 

Split sound and video tag parsing in separate functions.
parent e6496ea7
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Showing with 96 additions and 90 deletions
libavcodec/4xm.c
View file @ e7a44f87
......@@ -389,12 +389,14 @@ static int decode_p_frame(FourXContext *f, AVFrame *frame,
int x, y;
const int width = f->avctx->width;
const int height = f->avctx->height;
uint16_t *src = (uint16_t *)f->last_picture->data[0];
uint16_t *dst = (uint16_t *)frame->data[0];
const int stride = frame->linesize[0] >> 1;
uint16_t *src;
unsigned int bitstream_size, bytestream_size, wordstream_size, extra,
bytestream_offset, wordstream_offset;
src = (uint16_t *)f->last_picture->data[0];
if (f->version > 1) {
extra = 20;
bitstream_size = AV_RL32(buf + 8);
......
libavformat/4xm.c
View file @ e7a44f87
......@@ -72,8 +72,6 @@ typedef struct AudioTrack {
} AudioTrack;
typedef struct FourxmDemuxContext {
int width;
int height;
int video_stream_index;
int track_count;
AudioTrack *tracks;
......@@ -91,6 +89,96 @@ static int fourxm_probe(AVProbeData *p)
return AVPROBE_SCORE_MAX;
}
static int parse_vtrk(AVFormatContext *s,
FourxmDemuxContext *fourxm, uint8_t *buf, int size)
{
AVStream *st;
/* check that there is enough data */
if (size != vtrk_SIZE) {
return AVERROR_INVALIDDATA;
}
/* allocate a new AVStream */
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
avpriv_set_pts_info(st, 60, 1, fourxm->fps);
fourxm->video_stream_index = st->index;
st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
st->codec->codec_id = AV_CODEC_ID_4XM;
st->codec->extradata_size = 4;
st->codec->extradata = av_malloc(4);
AV_WL32(st->codec->extradata, AV_RL32(buf + 16));
st->codec->width = AV_RL32(buf + 36);
st->codec->height = AV_RL32(buf + 40);
return 0;
}
static int parse_strk(AVFormatContext *s,
FourxmDemuxContext *fourxm, uint8_t *buf, int size)
{
AVStream *st;
int track;
/* check that there is enough data */
if (size != strk_SIZE)
return AVERROR_INVALIDDATA;
track = AV_RL32(buf + 8);
if (track + 1 > fourxm->track_count) {
if (av_reallocp_array(&fourxm->tracks, track + 1, sizeof(AudioTrack)))
return AVERROR(ENOMEM);
memset(&fourxm->tracks[fourxm->track_count], 0,
sizeof(AudioTrack) * (track + 1 - fourxm->track_count));
fourxm->track_count = track + 1;
}
fourxm->tracks[track].adpcm = AV_RL32(buf + 12);
fourxm->tracks[track].channels = AV_RL32(buf + 36);
fourxm->tracks[track].sample_rate = AV_RL32(buf + 40);
fourxm->tracks[track].bits = AV_RL32(buf + 44);
fourxm->tracks[track].audio_pts = 0;
if (fourxm->tracks[track].channels <= 0 ||
fourxm->tracks[track].sample_rate <= 0 ||
fourxm->tracks[track].bits < 0) {
av_log(s, AV_LOG_ERROR, "audio header invalid\n");
return AVERROR_INVALIDDATA;
}
/* allocate a new AVStream */
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
st->id = track;
avpriv_set_pts_info(st, 60, 1, fourxm->tracks[track].sample_rate);
fourxm->tracks[track].stream_index = st->index;
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
st->codec->codec_tag = 0;
st->codec->channels = fourxm->tracks[track].channels;
st->codec->sample_rate = fourxm->tracks[track].sample_rate;
st->codec->bits_per_coded_sample = fourxm->tracks[track].bits;
st->codec->bit_rate = st->codec->channels *
st->codec->sample_rate *
st->codec->bits_per_coded_sample;
st->codec->block_align = st->codec->channels *
st->codec->bits_per_coded_sample;
if (fourxm->tracks[track].adpcm){
st->codec->codec_id = AV_CODEC_ID_ADPCM_4XM;
} else if (st->codec->bits_per_coded_sample == 8) {
st->codec->codec_id = AV_CODEC_ID_PCM_U8;
} else
st->codec->codec_id = AV_CODEC_ID_PCM_S16LE;
return 0;
}
static int fourxm_read_header(AVFormatContext *s)
{
AVIOContext *pb = s->pb;
......@@ -100,7 +188,6 @@ static int fourxm_read_header(AVFormatContext *s)
FourxmDemuxContext *fourxm = s->priv_data;
unsigned char *header;
int i, ret;
AVStream *st;
fourxm->track_count = 0;
fourxm->tracks = NULL;
......@@ -132,98 +219,15 @@ static int fourxm_read_header(AVFormatContext *s)
if (fourcc_tag == std__TAG) {
fourxm->fps = av_int2float(AV_RL32(&header[i + 12]));
} else if (fourcc_tag == vtrk_TAG) {
/* check that there is enough data */
if (size != vtrk_SIZE) {
ret = AVERROR_INVALIDDATA;
goto fail;
}
fourxm->width = AV_RL32(&header[i + 36]);
fourxm->height = AV_RL32(&header[i + 40]);
/* allocate a new AVStream */
st = avformat_new_stream(s, NULL);
if (!st) {
ret = AVERROR(ENOMEM);
if ((ret = parse_vtrk(s, fourxm, header + i, size)) < 0)
goto fail;
}
avpriv_set_pts_info(st, 60, 1, fourxm->fps);
fourxm->video_stream_index = st->index;
st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
st->codec->codec_id = AV_CODEC_ID_4XM;
st->codec->extradata_size = 4;
st->codec->extradata = av_malloc(4);
AV_WL32(st->codec->extradata, AV_RL32(&header[i + 16]));
st->codec->width = fourxm->width;
st->codec->height = fourxm->height;
i += 8 + size;
} else if (fourcc_tag == strk_TAG) {
int current_track;
/* check that there is enough data */
if (size != strk_SIZE) {
ret= AVERROR_INVALIDDATA;
if ((ret = parse_strk(s, fourxm, header + i, size)) < 0)
goto fail;
}
current_track = AV_RL32(&header[i + 8]);
if((unsigned)current_track >= UINT_MAX / sizeof(AudioTrack) - 1){
av_log(s, AV_LOG_ERROR, "current_track too large\n");
ret= -1;
goto fail;
}
if (current_track + 1 > fourxm->track_count) {
fourxm->tracks = av_realloc(fourxm->tracks,
(current_track + 1) * sizeof(AudioTrack));
if (!fourxm->tracks) {
ret = AVERROR(ENOMEM);
goto fail;
}
memset(&fourxm->tracks[fourxm->track_count], 0,
sizeof(AudioTrack) * (current_track + 1 - fourxm->track_count));
fourxm->track_count = current_track + 1;
}
fourxm->tracks[current_track].adpcm = AV_RL32(&header[i + 12]);
fourxm->tracks[current_track].channels = AV_RL32(&header[i + 36]);
fourxm->tracks[current_track].sample_rate = AV_RL32(&header[i + 40]);
fourxm->tracks[current_track].bits = AV_RL32(&header[i + 44]);
fourxm->tracks[current_track].audio_pts = 0;
if (fourxm->tracks[current_track].channels <= 0 ||
fourxm->tracks[current_track].sample_rate <= 0 ||
fourxm->tracks[current_track].bits < 0) {
av_log(s, AV_LOG_ERROR, "audio header invalid\n");
ret = -1;
goto fail;
}
i += 8 + size;
/* allocate a new AVStream */
st = avformat_new_stream(s, NULL);
if (!st) {
ret = AVERROR(ENOMEM);
goto fail;
}
st->id = current_track;
avpriv_set_pts_info(st, 60, 1,
fourxm->tracks[current_track].sample_rate);
fourxm->tracks[current_track].stream_index = st->index;
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
st->codec->codec_tag = 0;
st->codec->channels = fourxm->tracks[current_track].channels;
st->codec->sample_rate = fourxm->tracks[current_track].sample_rate;
st->codec->bits_per_coded_sample = fourxm->tracks[current_track].bits;
st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
st->codec->bits_per_coded_sample;
st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;
if (fourxm->tracks[current_track].adpcm){
st->codec->codec_id = AV_CODEC_ID_ADPCM_4XM;
} else if (st->codec->bits_per_coded_sample == 8) {
st->codec->codec_id = AV_CODEC_ID_PCM_U8;
} else
st->codec->codec_id = AV_CODEC_ID_PCM_S16LE;
i += 8 + size;
}
}
......
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