return frame[offs] == t ? &frame[offs] : NULL;
}
+static const int dv_audio_frequency[3] = {
+ 48000, 44100, 32000,
+};
+
/*
* There's a couple of assumptions being made here:
* 1. By default we silence erroneous (0x8000/16bit 0x800/12bit) audio samples.
if (quant > 1)
return -1; /* unsupported quantization */
+ if (freq >= FF_ARRAY_ELEMS(dv_audio_frequency))
+ return AVERROR_INVALIDDATA;
+
size = (sys->audio_min_samples[freq] + smpls) * 4; /* 2ch, 2bytes */
half_ch = sys->difseg_size / 2;
stype = (as_pack[3] & 0x1f); /* 0 - 2CH, 2 - 4CH, 3 - 8CH */
quant = as_pack[4] & 0x07; /* 0 - 16bit linear, 1 - 12bit nonlinear */
+ if (freq >= FF_ARRAY_ELEMS(dv_audio_frequency)) {
+ av_log(c->fctx, AV_LOG_ERROR,
+ "Unrecognized audio sample rate index (%d)\n", freq);
+ return 0;
+ }
+
if (stype > 3) {
av_log(c->fctx, AV_LOG_ERROR, "stype %d is invalid\n", stype);
c->ach = 0;
return NULL;
}
- c->sys = NULL;
- c->fctx = s;
- memset(c->ast, 0, sizeof(c->ast));
- c->ach = 0;
- c->frames = 0;
- c->abytes = 0;
-
+ c->fctx = s;
c->vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
c->vst->codec->codec_id = CODEC_ID_DVVIDEO;
c->vst->codec->bit_rate = 25000000;
return offset + s->data_offset;
}
-void dv_offset_reset(DVDemuxContext *c, int64_t frame_offset)
+void ff_dv_offset_reset(DVDemuxContext *c, int64_t frame_offset)
{
c->frames= frame_offset;
if (c->ach)
}
AV_WB32(c->buf, state);
- if (avio_read(s->pb, c->buf + 4, DV_PROFILE_BYTES - 4) <= 0 ||
+ if (avio_read(s->pb, c->buf + 4, DV_PROFILE_BYTES - 4) != DV_PROFILE_BYTES - 4 ||
avio_seek(s->pb, -DV_PROFILE_BYTES, SEEK_CUR) < 0)
return AVERROR(EIO);
if (avio_seek(s->pb, offset, SEEK_SET) < 0)
return -1;
- dv_offset_reset(c, offset / c->sys->frame_size);
+ ff_dv_offset_reset(c, offset / c->sys->frame_size);
return 0;
}