From 33d18982fa03feb061c8f744a4f0a9175c1f63ab Mon Sep 17 00:00:00 2001
From: Anton Khirnov <anton@khirnov.net>
Date: Sat, 23 Nov 2013 11:43:13 +0100
Subject: lavc: add a new bitstream filtering API

Deprecate the current bitstream filtering API.
---
 libavcodec/mjpega_dump_header_bsf.c | 106 ++++++++++++++++++++----------------
 1 file changed, 59 insertions(+), 47 deletions(-)

(limited to 'libavcodec/mjpega_dump_header_bsf.c')

diff --git a/libavcodec/mjpega_dump_header_bsf.c b/libavcodec/mjpega_dump_header_bsf.c
index dfb8916dd9..b3ce26a664 100644
--- a/libavcodec/mjpega_dump_header_bsf.c
+++ b/libavcodec/mjpega_dump_header_bsf.c
@@ -26,71 +26,83 @@
  */
 
 #include "avcodec.h"
+#include "bsf.h"
 #include "bytestream.h"
 #include "mjpeg.h"
 
 
-static int mjpega_dump_header(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args,
-                              uint8_t **poutbuf, int *poutbuf_size,
-                              const uint8_t *buf, int buf_size, int keyframe)
+static int mjpega_dump_header(AVBSFContext *ctx, AVPacket *out)
 {
-    uint8_t *poutbufp;
+    AVPacket *in;
+    uint8_t *out_buf;
     unsigned dqt = 0, dht = 0, sof0 = 0;
-    int i;
+    int ret = 0, i;
 
-    if (avctx->codec_id != AV_CODEC_ID_MJPEG) {
-        av_log(avctx, AV_LOG_ERROR, "mjpega bitstream filter only applies to mjpeg codec\n");
-        return 0;
-    }
+    ret = ff_bsf_get_packet(ctx, &in);
+    if (ret < 0)
+        return ret;
+
+    ret = av_new_packet(out, in->size + 44);
+    if (ret < 0)
+        goto fail;
+
+    ret = av_packet_copy_props(out, in);
+    if (ret < 0)
+        goto fail;
 
-    *poutbuf_size = 0;
-    *poutbuf = av_malloc(buf_size + 44 + AV_INPUT_BUFFER_PADDING_SIZE);
-    if (!*poutbuf)
-        return AVERROR(ENOMEM);
-    poutbufp = *poutbuf;
-    bytestream_put_byte(&poutbufp, 0xff);
-    bytestream_put_byte(&poutbufp, SOI);
-    bytestream_put_byte(&poutbufp, 0xff);
-    bytestream_put_byte(&poutbufp, APP1);
-    bytestream_put_be16(&poutbufp, 42); /* size */
-    bytestream_put_be32(&poutbufp, 0);
-    bytestream_put_buffer(&poutbufp, "mjpg", 4);
-    bytestream_put_be32(&poutbufp, buf_size + 44); /* field size */
-    bytestream_put_be32(&poutbufp, buf_size + 44); /* pad field size */
-    bytestream_put_be32(&poutbufp, 0);             /* next ptr */
+    out_buf = out->data;
+    bytestream_put_byte(&out_buf, 0xff);
+    bytestream_put_byte(&out_buf, SOI);
+    bytestream_put_byte(&out_buf, 0xff);
+    bytestream_put_byte(&out_buf, APP1);
+    bytestream_put_be16(&out_buf, 42); /* size */
+    bytestream_put_be32(&out_buf, 0);
+    bytestream_put_buffer(&out_buf, "mjpg", 4);
+    bytestream_put_be32(&out_buf, in->size + 44); /* field size */
+    bytestream_put_be32(&out_buf, in->size + 44); /* pad field size */
+    bytestream_put_be32(&out_buf, 0);             /* next ptr */
 
-    for (i = 0; i < buf_size - 1; i++) {
-        if (buf[i] == 0xff) {
-            switch (buf[i + 1]) {
+    for (i = 0; i < in->size - 1; i++) {
+        if (in->data[i] == 0xff) {
+            switch (in->data[i + 1]) {
             case DQT:  dqt  = i + 46; break;
             case DHT:  dht  = i + 46; break;
             case SOF0: sof0 = i + 46; break;
             case SOS:
-                bytestream_put_be32(&poutbufp, dqt); /* quant off */
-                bytestream_put_be32(&poutbufp, dht); /* huff off */
-                bytestream_put_be32(&poutbufp, sof0); /* image off */
-                bytestream_put_be32(&poutbufp, i + 46); /* scan off */
-                bytestream_put_be32(&poutbufp, i + 46 + AV_RB16(buf + i + 2)); /* data off */
-                bytestream_put_buffer(&poutbufp, buf + 2, buf_size - 2); /* skip already written SOI */
-                *poutbuf_size = poutbufp - *poutbuf;
-                return 1;
+                bytestream_put_be32(&out_buf, dqt); /* quant off */
+                bytestream_put_be32(&out_buf, dht); /* huff off */
+                bytestream_put_be32(&out_buf, sof0); /* image off */
+                bytestream_put_be32(&out_buf, i + 46); /* scan off */
+                bytestream_put_be32(&out_buf, i + 46 + AV_RB16(in->data + i + 2)); /* data off */
+                bytestream_put_buffer(&out_buf, in->data + 2, in->size - 2); /* skip already written SOI */
+
+                out->size = out_buf - out->data;
+                av_packet_free(&in);
+                return 0;
             case APP1:
-                if (i + 8 < buf_size && AV_RL32(buf + i + 8) == AV_RL32("mjpg")) {
-                    av_log(avctx, AV_LOG_ERROR, "bitstream already formatted\n");
-                    memcpy(*poutbuf, buf, buf_size);
-                    *poutbuf_size = buf_size;
-                    return 1;
+                if (i + 8 < in->size && AV_RL32(in->data + i + 8) == AV_RL32("mjpg")) {
+                    av_log(ctx, AV_LOG_ERROR, "bitstream already formatted\n");
+                    av_packet_unref(out);
+                    av_packet_move_ref(out, in);
+                    av_packet_free(&in);
+                    return 0;
                 }
             }
         }
     }
-    av_freep(poutbuf);
-    av_log(avctx, AV_LOG_ERROR, "could not find SOS marker in bitstream\n");
-    return 0;
+    av_log(ctx, AV_LOG_ERROR, "could not find SOS marker in bitstream\n");
+fail:
+    av_packet_unref(out);
+    av_packet_free(&in);
+    return AVERROR_INVALIDDATA;
 }
 
-AVBitStreamFilter ff_mjpega_dump_header_bsf = {
-    "mjpegadump",
-    0,
-    mjpega_dump_header,
+static const enum AVCodecID codec_ids[] = {
+    AV_CODEC_ID_MJPEG, AV_CODEC_ID_NONE,
+};
+
+const AVBitStreamFilter ff_mjpega_dump_header_bsf = {
+    .name      = "mjpegadump",
+    .filter    = mjpega_dump_header,
+    .codec_ids = codec_ids,
 };
-- 
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