mpegts: add support for Opus

Signed-off-by: Anton Khirnov <anton@khirnov.net>

libavcodec/opus.c

@@ -290,10 +290,6 @@ av_cold int ff_opus_parse_extradata(AVCodecContext *avctx,
                                     OpusContext *s)
 {
     static const uint8_t default_channel_map[2] = { 0, 1 };
-    uint8_t default_extradata[19] = {
-        'O', 'p', 'u', 's', 'H', 'e', 'a', 'd',
-        1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-    };
 
     int (*channel_reorder)(int, int) = channel_reorder_unknown;
 
@@ -308,9 +304,8 @@ av_cold int ff_opus_parse_extradata(AVCodecContext *avctx,
                    "Multichannel configuration without extradata.\n");
             return AVERROR(EINVAL);
         }
-        default_extradata[9] = (avctx->channels == 1) ? 1 : 2;
-        extradata      = default_extradata;
-        extradata_size = sizeof(default_extradata);
+        extradata      = opus_default_extradata;
+        extradata_size = sizeof(opus_default_extradata);
     } else {
         extradata = avctx->extradata;
         extradata_size = avctx->extradata_size;
@@ -330,7 +325,7 @@ av_cold int ff_opus_parse_extradata(AVCodecContext *avctx,
 
     avctx->delay = AV_RL16(extradata + 10);
 
-    channels = extradata[9];
+    channels = avctx->extradata ? extradata[9] : (avctx->channels == 1) ? 1 : 2;
     if (!channels) {
         av_log(avctx, AV_LOG_ERROR, "Zero channel count specified in the extadata\n");
         return AVERROR_INVALIDDATA;

libavcodec/opus.h

@@ -61,6 +61,15 @@
 #define ROUND_MUL16(a,b)  ((MUL16(a, b) + 16384) >> 15)
 #define opus_ilog(i) (av_log2(i) + !!(i))
 
+#define OPUS_TS_HEADER     0x7FE0        // 0x3ff (11 bits)
+#define OPUS_TS_MASK       0xFFE0        // top 11 bits
+
+static const uint8_t opus_default_extradata[30] = {
+    'O', 'p', 'u', 's', 'H', 'e', 'a', 'd',
+    1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+};
+
 enum OpusMode {
     OPUS_MODE_SILK,
     OPUS_MODE_HYBRID,

libavcodec/opus_parser.c

@@ -26,50 +26,163 @@
  */
 
 #include "avcodec.h"
+#include "bytestream.h"
 #include "opus.h"
+#include "parser.h"
 
 typedef struct OpusParseContext {
     OpusContext ctx;
     OpusPacket pkt;
     int extradata_parsed;
+    ParseContext pc;
+    int ts_framing;
 } OpusParseContext;
 
-static int opus_parse(AVCodecParserContext *ctx, AVCodecContext *avctx,
-                      const uint8_t **poutbuf, int *poutbuf_size,
-                      const uint8_t *buf, int buf_size)
+static const uint8_t *parse_opus_ts_header(const uint8_t *start, int *payload_len, int buf_len)
+{
+    const uint8_t *buf = start + 1;
+    int start_trim_flag, end_trim_flag, control_extension_flag, control_extension_length, i;
+    uint8_t flags;
+
+    GetByteContext gb;
+    bytestream2_init(&gb, buf, buf_len);
+
+    flags = bytestream2_get_byte(&gb);
+    start_trim_flag        = (flags >> 4) & 1;
+    end_trim_flag          = (flags >> 3) & 1;
+    control_extension_flag = (flags >> 2) & 1;
+
+    *payload_len = 0;
+    while (bytestream2_peek_byte(&gb) == 0xff)
+        *payload_len += bytestream2_get_byte(&gb);
+
+    *payload_len += bytestream2_get_byte(&gb);
+
+    if (start_trim_flag)
+        bytestream2_skip(&gb, 2);
+    if (end_trim_flag)
+        bytestream2_skip(&gb, 2);
+    if (control_extension_flag) {
+        control_extension_length = bytestream2_get_byte(&gb);
+        bytestream2_skip(&gb, control_extension_length);
+    }
+
+    return buf + bytestream2_tell(&gb);
+}
+
+/**
+ * Find the end of the current frame in the bitstream.
+ * @return the position of the first byte of the next frame, or -1
+ */
+static int opus_find_frame_end(AVCodecParserContext *ctx, AVCodecContext *avctx,
+                               const uint8_t *buf, int buf_size, int *header_len)
 {
     OpusParseContext *s = ctx->priv_data;
-    int ret;
+    ParseContext *pc    = &s->pc;
+    int ret, start_found, i = 0, payload_len = 0;
+    const uint8_t *payload;
+    uint32_t state;
+    uint16_t hdr;
+    *header_len = 0;
 
     if (!buf_size)
         return 0;
 
+    start_found = pc->frame_start_found;
+    state = pc->state;
+    payload = buf;
+
+    /* Check if we're using Opus in MPEG-TS framing */
+    if (!s->ts_framing && buf_size > 2) {
+        hdr = AV_RB16(buf);
+        if ((hdr & OPUS_TS_MASK) == OPUS_TS_HEADER)
+            s->ts_framing = 1;
+    }
+
+    if (s->ts_framing && !start_found) {
+        for (i = 0; i < buf_size-2; i++) {
+            state = (state << 8) | payload[i];
+            if ((state & OPUS_TS_MASK) == OPUS_TS_HEADER) {
+                payload = parse_opus_ts_header(payload, &payload_len, buf_size - i);
+                *header_len = payload - buf;
+                start_found = 1;
+                break;
+            }
+        }
+    }
+
+    if (!s->ts_framing)
+        payload_len = buf_size;
+
     if (avctx->extradata && !s->extradata_parsed) {
         ret = ff_opus_parse_extradata(avctx, &s->ctx);
         if (ret < 0) {
             av_log(avctx, AV_LOG_ERROR, "Error parsing Ogg extradata.\n");
-            goto fail;
+            return AVERROR_INVALIDDATA;
         }
         av_freep(&s->ctx.channel_maps);
         s->extradata_parsed = 1;
     }
 
-    ret = ff_opus_parse_packet(&s->pkt, buf, buf_size, s->ctx.nb_streams > 1);
-    if (ret < 0) {
-        av_log(avctx, AV_LOG_ERROR, "Error parsing Opus packet header.\n");
-        goto fail;
+    if (payload_len <= buf_size && (!s->ts_framing || start_found)) {
+        ret = ff_opus_parse_packet(&s->pkt, payload, payload_len, s->ctx.nb_streams > 1);
+        if (ret < 0) {
+            av_log(avctx, AV_LOG_ERROR, "Error parsing Opus packet header.\n");
+            pc->frame_start_found = 0;
+            return AVERROR_INVALIDDATA;
+        }
+
+        ctx->duration = s->pkt.frame_count * s->pkt.frame_duration;
     }
 
-    ctx->duration = s->pkt.frame_count * s->pkt.frame_duration;
+    if (s->ts_framing) {
+        if (start_found) {
+            if (payload_len + *header_len <= buf_size) {
+                pc->frame_start_found = 0;
+                pc->state             = -1;
+                return payload_len + *header_len;
+            }
+        }
+
+        pc->frame_start_found = start_found;
+        pc->state = state;
+        return END_NOT_FOUND;
+    }
 
-fail:
-    *poutbuf = buf;
-    *poutbuf_size = buf_size;
     return buf_size;
 }
 
+static int opus_parse(AVCodecParserContext *ctx, AVCodecContext *avctx,
+                       const uint8_t **poutbuf, int *poutbuf_size,
+                       const uint8_t *buf, int buf_size)
+{
+    OpusParseContext *s = ctx->priv_data;
+    ParseContext *pc    = &s->pc;
+    int next, header_len;
+
+    next = opus_find_frame_end(ctx, avctx, buf, buf_size, &header_len);
+
+    if (s->ts_framing && next != AVERROR_INVALIDDATA &&
+        ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
+        *poutbuf      = NULL;
+        *poutbuf_size = 0;
+        return buf_size;
+    }
+
+    if (next == AVERROR_INVALIDDATA){
+        *poutbuf      = NULL;
+        *poutbuf_size = 0;
+        return buf_size;
+    }
+
+    *poutbuf      = buf + header_len;
+    *poutbuf_size = buf_size - header_len;
+    return next;
+}
+
 AVCodecParser ff_opus_parser = {
     .codec_ids      = { AV_CODEC_ID_OPUS },
     .priv_data_size = sizeof(OpusParseContext),
     .parser_parse   = opus_parse,
+    .parser_close   = ff_parse_close
 };

libavformat/mpegts.c

@@ -28,6 +28,7 @@
 #include "libavutil/opt.h"
 #include "libavcodec/bytestream.h"
 #include "libavcodec/get_bits.h"
+#include "libavcodec/opus.h"
 #include "avformat.h"
 #include "mpegts.h"
 #include "internal.h"
@@ -613,6 +614,7 @@ static const StreamType REGD_types[] = {
     { MKTAG('D', 'T', 'S', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS   },
     { MKTAG('H', 'E', 'V', 'C'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_HEVC  },
     { MKTAG('V', 'C', '-', '1'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1   },
+    { MKTAG('O', 'p', 'u', 's'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_OPUS  },
     { 0 },
 };
 
@@ -1314,13 +1316,32 @@ static void m4sl_cb(MpegTSFilter *filter, const uint8_t *section,
         av_free(mp4_descr[i].dec_config_descr);
 }
 
+static const uint8_t opus_coupled_stream_cnt[9] = {
+    1, 0, 1, 1, 2, 2, 2, 3, 3
+};
+
+static const uint8_t opus_stream_cnt[9] = {
+    1, 1, 1, 2, 2, 3, 4, 4, 5,
+};
+
+static const uint8_t opus_channel_map[8][8] = {
+    { 0 },
+    { 0,1 },
+    { 0,2,1 },
+    { 0,1,2,3 },
+    { 0,4,1,2,3 },
+    { 0,4,1,2,3,5 },
+    { 0,4,1,2,3,5,6 },
+    { 0,6,1,2,3,4,5,7 },
+};
+
 int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type,
                               const uint8_t **pp, const uint8_t *desc_list_end,
                               Mp4Descr *mp4_descr, int mp4_descr_count, int pid,
                               MpegTSContext *ts)
 {
     const uint8_t *desc_end;
-    int desc_len, desc_tag, desc_es_id;
+    int desc_len, desc_tag, desc_es_id, ext_desc_tag, channels, channel_config_code;
     char language[252];
     int i;
 
@@ -1444,6 +1465,37 @@ int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type
         if (st->codec->codec_id == AV_CODEC_ID_NONE)
             mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
         break;
+    case 0x7f: /* DVB extension descriptor */
+        ext_desc_tag = get8(pp, desc_end);
+        if (ext_desc_tag < 0)
+            return AVERROR_INVALIDDATA;
+        if (st->codec->codec_id == AV_CODEC_ID_OPUS &&
+            ext_desc_tag == 0x80) { /* User defined (provisional Opus) */
+            if (!st->codec->extradata) {
+                st->codec->extradata = av_mallocz(sizeof(opus_default_extradata) +
+                                                  FF_INPUT_BUFFER_PADDING_SIZE);
+                if (!st->codec->extradata)
+                    return AVERROR(ENOMEM);
+
+                st->codec->extradata_size = sizeof(opus_default_extradata);
+                memcpy(st->codec->extradata, opus_default_extradata, sizeof(opus_default_extradata));
+
+                channel_config_code = get8(pp, desc_end);
+                if (channel_config_code < 0)
+                    return AVERROR_INVALIDDATA;
+                if (channel_config_code <= 0x8) {
+                    st->codec->extradata[9]  = channels = channel_config_code ? channel_config_code : 2;
+                    st->codec->extradata[18] = channel_config_code ? (channels > 2) : 255;
+                    st->codec->extradata[19] = opus_stream_cnt[channel_config_code];
+                    st->codec->extradata[20] = opus_coupled_stream_cnt[channel_config_code];
+                    memcpy(&st->codec->extradata[21], opus_channel_map[channels - 1], channels);
+                } else {
+                    avpriv_request_sample(fc, "Opus in MPEG-TS - channel_config_code > 0x8");
+                }
+                st->need_parsing = AVSTREAM_PARSE_FULL;
+            }
+        }
+        break;
     default:
         break;
     }