lavc: add a new bitstream filtering API

Deprecate the current bitstream filtering API.

1 files changed, 88 insertions, 63 deletions

diff --git a/libavcodec/h264_mp4toannexb_bsf.c b/libavcodec/h264_mp4toannexb_bsf.c
index eeb250f..c1e2a28 100644
--- a/libavcodec/h264_mp4toannexb_bsf.c
+++ b/libavcodec/h264_mp4toannexb_bsf.c
@@ -23,7 +23,9 @@
 
 #include "libavutil/intreadwrite.h"
 #include "libavutil/mem.h"
+
 #include "avcodec.h"
+#include "bsf.h"
 
 typedef struct H264BSFContext {
     uint8_t  length_size;
@@ -31,41 +33,39 @@ typedef struct H264BSFContext {
     int      extradata_parsed;
 } H264BSFContext;
 
-static int alloc_and_copy(uint8_t **poutbuf, int *poutbuf_size,
+static int alloc_and_copy(AVPacket *out,
                           const uint8_t *sps_pps, uint32_t sps_pps_size,
                           const uint8_t *in, uint32_t in_size)
 {
-    uint32_t offset         = *poutbuf_size;
+    uint32_t offset         = out->size;
     uint8_t nal_header_size = offset ? 3 : 4;
     int err;
 
-    *poutbuf_size += sps_pps_size + in_size + nal_header_size;
-    if ((err = av_reallocp(poutbuf,
-                           *poutbuf_size + AV_INPUT_BUFFER_PADDING_SIZE)) < 0) {
-        *poutbuf_size = 0;
+    err = av_grow_packet(out, sps_pps_size + in_size + nal_header_size);
+    if (err < 0)
         return err;
-    }
+
     if (sps_pps)
-        memcpy(*poutbuf + offset, sps_pps, sps_pps_size);
-    memcpy(*poutbuf + sps_pps_size + nal_header_size + offset, in, in_size);
+        memcpy(out->data + offset, sps_pps, sps_pps_size);
+    memcpy(out->data + sps_pps_size + nal_header_size + offset, in, in_size);
     if (!offset) {
-        AV_WB32(*poutbuf + sps_pps_size, 1);
+        AV_WB32(out->data + sps_pps_size, 1);
     } else {
-        (*poutbuf + offset + sps_pps_size)[0] =
-        (*poutbuf + offset + sps_pps_size)[1] = 0;
-        (*poutbuf + offset + sps_pps_size)[2] = 1;
+        (out->data + offset + sps_pps_size)[0] =
+        (out->data + offset + sps_pps_size)[1] = 0;
+        (out->data + offset + sps_pps_size)[2] = 1;
     }
 
     return 0;
 }
 
-static int h264_extradata_to_annexb(AVCodecContext *avctx, const int padding)
+static int h264_extradata_to_annexb(AVBSFContext *ctx, const int padding)
 {
     uint16_t unit_size;
     uint64_t total_size                 = 0;
     uint8_t *out                        = NULL, unit_nb, sps_done = 0,
              sps_seen                   = 0, pps_seen = 0;
-    const uint8_t *extradata            = avctx->extradata + 4;
+    const uint8_t *extradata            = ctx->par_in->extradata + 4;
     static const uint8_t nalu_header[4] = { 0, 0, 0, 1 };
     int length_size = (*extradata++ & 0x3) + 1; // retrieve length coded size
 
@@ -90,8 +90,8 @@ static int h264_extradata_to_annexb(AVCodecContext *avctx, const int padding)
         unit_size   = AV_RB16(extradata);
         total_size += unit_size + 4;
         if (total_size > INT_MAX - padding ||
-            extradata + 2 + unit_size > avctx->extradata +
-            avctx->extradata_size) {
+            extradata + 2 + unit_size > ctx->par_in->extradata +
+            ctx->par_in->extradata_size) {
             av_free(out);
             return AVERROR(EINVAL);
         }
@@ -112,100 +112,125 @@ static int h264_extradata_to_annexb(AVCodecContext *avctx, const int padding)
         memset(out + total_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
 
     if (!sps_seen)
-        av_log(avctx, AV_LOG_WARNING,
+        av_log(ctx, AV_LOG_WARNING,
                "Warning: SPS NALU missing or invalid. "
                "The resulting stream may not play.\n");
 
     if (!pps_seen)
-        av_log(avctx, AV_LOG_WARNING,
+        av_log(ctx, AV_LOG_WARNING,
                "Warning: PPS NALU missing or invalid. "
                "The resulting stream may not play.\n");
 
-    av_free(avctx->extradata);
-    avctx->extradata      = out;
-    avctx->extradata_size = total_size;
+    av_freep(&ctx->par_out->extradata);
+    ctx->par_out->extradata      = out;
+    ctx->par_out->extradata_size = total_size;
 
     return length_size;
 }
 
-static int h264_mp4toannexb_filter(AVBitStreamFilterContext *bsfc,
-                                   AVCodecContext *avctx, const char *args,
-                                   uint8_t **poutbuf, int *poutbuf_size,
-                                   const uint8_t *buf, int buf_size,
-                                   int keyframe)
+static int h264_mp4toannexb_init(AVBSFContext *ctx)
 {
-    H264BSFContext *ctx = bsfc->priv_data;
+    H264BSFContext *s = ctx->priv_data;
+    int ret;
+
+    /* retrieve sps and pps NAL units from extradata */
+    if (ctx->par_in->extradata_size >= 6) {
+        ret = h264_extradata_to_annexb(ctx, AV_INPUT_BUFFER_PADDING_SIZE);
+        if (ret < 0)
+            return ret;
+
+        s->length_size      = ret;
+        s->first_idr        = 1;
+        s->extradata_parsed = 1;
+    }
+
+    return 0;
+}
+
+static int h264_mp4toannexb_filter(AVBSFContext *ctx, AVPacket *out)
+{
+    H264BSFContext *s = ctx->priv_data;
+
+    AVPacket *in;
     uint8_t unit_type;
     int32_t nal_size;
     uint32_t cumul_size    = 0;
-    const uint8_t *buf_end = buf + buf_size;
+    const uint8_t *buf;
+    const uint8_t *buf_end;
+    int            buf_size;
     int ret = 0;
 
+    ret = ff_bsf_get_packet(ctx, &in);
+    if (ret < 0)
+        return ret;
+
     /* nothing to filter */
-    if (!avctx->extradata || avctx->extradata_size < 6) {
-        *poutbuf      = (uint8_t *)buf;
-        *poutbuf_size = buf_size;
+    if (!s->extradata_parsed) {
+        av_packet_move_ref(out, in);
+        av_packet_free(&in);
         return 0;
     }
 
-    /* retrieve sps and pps NAL units from extradata */
-    if (!ctx->extradata_parsed) {
-        ret = h264_extradata_to_annexb(avctx, AV_INPUT_BUFFER_PADDING_SIZE);
-        if (ret < 0)
-            return ret;
-        ctx->length_size      = ret;
-        ctx->first_idr        = 1;
-        ctx->extradata_parsed = 1;
-    }
+    buf      = in->data;
+    buf_size = in->size;
+    buf_end  = in->data + in->size;
 
-    *poutbuf_size = 0;
-    *poutbuf      = NULL;
     do {
-        if (buf + ctx->length_size > buf_end)
+        if (buf + s->length_size > buf_end)
             goto fail;
 
-        if (ctx->length_size == 1) {
+        if (s->length_size == 1) {
             nal_size = buf[0];
-        } else if (ctx->length_size == 2) {
+        } else if (s->length_size == 2) {
             nal_size = AV_RB16(buf);
         } else
             nal_size = AV_RB32(buf);
 
-        buf      += ctx->length_size;
+        buf += s->length_size;
         unit_type = *buf & 0x1f;
 
         if (buf + nal_size > buf_end || nal_size < 0)
             goto fail;
 
         /* prepend only to the first type 5 NAL unit of an IDR picture */
-        if (ctx->first_idr && unit_type == 5) {
-            if (alloc_and_copy(poutbuf, poutbuf_size,
-                               avctx->extradata, avctx->extradata_size,
+        if (s->first_idr && unit_type == 5) {
+            if (alloc_and_copy(out,
+                               ctx->par_out->extradata, ctx->par_out->extradata_size,
                                buf, nal_size) < 0)
                 goto fail;
-            ctx->first_idr = 0;
+            s->first_idr = 0;
         } else {
-            if (alloc_and_copy(poutbuf, poutbuf_size,
+            if (alloc_and_copy(out,
                                NULL, 0, buf, nal_size) < 0)
                 goto fail;
-            if (!ctx->first_idr && unit_type == 1)
-                ctx->first_idr = 1;
+            if (!s->first_idr && unit_type == 1)
+                s->first_idr = 1;
         }
 
         buf        += nal_size;
-        cumul_size += nal_size + ctx->length_size;
+        cumul_size += nal_size + s->length_size;
     } while (cumul_size < buf_size);
 
-    return 1;
+    ret = av_packet_copy_props(out, in);
+    if (ret < 0)
+        goto fail;
 
 fail:
-    av_freep(poutbuf);
-    *poutbuf_size = 0;
-    return AVERROR(EINVAL);
+    if (ret < 0)
+        av_packet_unref(out);
+    av_packet_free(&in);
+
+    return ret;
 }
 
-AVBitStreamFilter ff_h264_mp4toannexb_bsf = {
-    "h264_mp4toannexb",
-    sizeof(H264BSFContext),
-    h264_mp4toannexb_filter,
+static const enum AVCodecID codec_ids[] = {
+    AV_CODEC_ID_H264, AV_CODEC_ID_NONE,
+};
+
+const AVBitStreamFilter ff_h264_mp4toannexb_bsf = {
+    .name           = "h264_mp4toannexb",
+    .priv_data_size = sizeof(H264BSFContext),
+    .init           = h264_mp4toannexb_init,
+    .filter         = h264_mp4toannexb_filter,
+    .codec_ids      = codec_ids,
 };